I was able to recreate this in my own bare jgroups tests. I made a test where 4 members join and do a separate getState. The test does this repeatedly 10 times. Having loopback true fails at least on of these 10 runs. Having loopback false gives much better performance.
I have isolated the problem and I am testing a fix that would handle this problem regardless of loopback being turned of or on!
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Currently, the classloader system is the issue to get AS5 working under a security manager. Your approach of security.xml did the same (introduction of SM after the CL).
file:/some/directory/my.jar/sub.jar is still being opened and its permissions read by the Policy implementation. This is where we have issues. We cannot read the vfs urls and the introduction of the VFS handlers into bootstrap is unknown territory at the moment.
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